Turbine



Feb. 27,1923. 1;447,0s1.

H. T. HERR. TURBINE.

FILED DEC. 20, 1920.

IN VEN TOR. HTM/r ATTORNEY Patented Feb. 27, 1923.

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HERBERT T. HERB, or MERION, PENNSYLVANIA, ASSIGNOR; To WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

TURBIN I Application filed December 20, 1920. SerialNo. 431,929. I v

T 0 all whomit may concern:

Be it known that 1, ROBERT T. HERR, a

citizen of the United States and a resident of Merion, in the county of Montgomery and State of Pennsylvania, have invented a new and useful Improvement in Turbines,

overheatng of the ahead section when the astern section is in operation. This arises from the fact that there is a churning of steam in the ahead section which causes the development of a high degree of friction, manifesting itself as heat, and if no way is provided for dissipating this heat, the blad-- ing of the ahead section is injured. I,the refore, provide means for the free circulation of steam through an idle section for cooling.

Referring to the drawing for a more detailed description of my invention; the turbine shown includes a cylinder or housing 10 and a rotor 11. The ahead blading section is of the single flow combination type comprising an impulse'section 12, a. high-pressure reaction section 13, and a low-pressure reaction section 1 1. The astern blading comprises an impulse section 15. Both the ahead 40 blading section and the astern blading section exhaust into the same exhaust chamber 16. The chamber 17 between the high and low-pressure reaction sections of the ahead section communicates with the exhaust chamber 16 by means of a by-pass 18, a valve 19 being placed in the bypass to be closed when the turbine is running ahead In a marine turbine, having both ahead and astern blading sections exhausting into the same exhaust chamber, when the turbine is running astern, exhaust steam from the astern section enters the ahead section. The steam in the ahead section is then churned about, causing a high degree of friction and consequently much heat isdeveloped. The

blading maybe heated tosuch .a high temperature that it will be injured. By pr0vid-.

ing a bypassbetwe'en the hottest part of the ahead section and the exhaust chamber,

as shown, exhaust steam, from the reversing stage is circulated through. one or more ahead stages-and tends todissipate heat in case the temperature of the ahead stage or stages tends to'exceed the temperature of the exhaust steam. When the turbine is running ahead, the valve in the by-pass. must'b'e closed or else hlgh'pressure steam would by-pass the low pressure reaction blading and discharge into theexhaust chamber.

' From the foregoing, it, will be seen that I have devised a very simple means 'to prevent overheating of turbine stages when the reverse stage is operative, and it is obvious that the means shown might be applied to reversing stages in case of development of objectionableoverheating therein when the turbine is operated ahead.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of. various other changes and modi fications, without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

What I claim is: J 1.111 a turbine, the combination of forward and reversing sections, one of which 1 has a multiplicity of stages, an exhaust con nectionfor the sections, and a b-y-pass connection between a point intermediate of said multiplicity of stages, whereby, when the latter are running idly, circulation of lowpressure steam through the stages tending tobecome the hottest is effected.

2. In a turbine, the combination of ahead heating of said portion of the ahead blading. s

3. In a turbine, theoombination of a highpressure section, a low-pressure section, a reversing section, acommon exhaust connection for the low -.pressure and reversing sections, and a by-pass affording communication between the exhaust connectionand with the spacebetween the "high and lowpressure sections whereby, when the reversing section is operative, circulation is established through the low-pressure section to avoid overheating; and a valve in the bypass to close the latter when the high and low-pressure sections are operative.

4. In a turbine, the combination of an ahead section including-a multiplicity of reaction stages, a reversing section, an exhaust connection for the sections, and a by-pass connection between the exhaust connection and a point intermediate of said multiplicity of reaction stages, whereby, when the latter are running idly, circulation of low-pressure steam is effected from the exhaust connection, through the reaction blading between the exhaust connection and said intermedi ate point, and through the by-pass connection to the exhaust connection, in order to cool those reaction stages tending to become the hottest when operating idly and in a re verse direction.

In testimony whereof, I have hereunto subscribed my name thisl ith day of December, 1920.

HERBERT T. HERB. 

